diff --git a/src/field_descriptor.cpp b/src/field_descriptor.cpp
index cfdeb48b990af4fc950238b6466243efbdde737c..3bbfdc74cc0e0071673c73a55c6be6ea68f94eea 100644
--- a/src/field_descriptor.cpp
+++ b/src/field_descriptor.cpp
@@ -240,7 +240,22 @@ int field_descriptor::interleave(
     // TODO: implement inplace interleaver
     for (int k = 0; k < this->local_size; k++)
         for (int j = 0; j < dim; j++)
-                output[k*dim + j] = input[j*this->local_size + k];
+            output[k*dim + j] = input[j*this->local_size + k];
+    return EXIT_SUCCESS;
+}
+
+int field_descriptor::interleave(
+        fftw_complex *input,
+        fftw_complex *output,
+        int dim)
+{
+    // TODO: implement inplace interleaver
+    for (int k = 0; k < this->local_size; k++)
+        for (int j = 0; j < dim; j++)
+        {
+            output[k*dim + j][0] = input[j*this->local_size + k][0];
+            output[k*dim + j][1] = input[j*this->local_size + k][1];
+        }
     return EXIT_SUCCESS;
 }
 
diff --git a/src/field_descriptor.hpp b/src/field_descriptor.hpp
index e60fe02ebac2b19ae3439bb66cdb3eb61c9d2ad1..271d3d8e243f42f1f0c5389ab350e134e21cae2a 100644
--- a/src/field_descriptor.hpp
+++ b/src/field_descriptor.hpp
@@ -59,6 +59,10 @@ class field_descriptor
                 float *input,
                 float *output,
                 int dim);
+        int interleave(
+                fftw_complex *input,
+                fftw_complex *output,
+                int dim);
 };
 
 
diff --git a/test.ipynb b/test.ipynb
index cd4fac53640eb6f97bf719a34db53c776c0ba67f..f3f44a60ef5cfbe9e7110390f1ff97598377eff7 100644
--- a/test.ipynb
+++ b/test.ipynb
@@ -1,7 +1,7 @@
 {
  "metadata": {
   "name": "",
-  "signature": "sha256:aed492730f0495b9d00b7ba907dfed5ad60d60c630d5b2be9985069ccf8932ed"
+  "signature": "sha256:7dead44f793111d0f8b169a9c6b140d43b9ac207648b3787a6263fd3ff30f493"
  },
  "nbformat": 3,
  "nbformat_minor": 0,
@@ -200,7 +200,7 @@
      "language": "python",
      "metadata": {},
      "outputs": [],
-     "prompt_number": 22
+     "prompt_number": 23
     },
     {
      "cell_type": "code",